Toothbrush



FIG. 1 shows a front view of my design for a toothbrush;

FIG. 2 shows a side view thereof;

FIG. 3 shows a back view thereof;

FIG. 4 shows a bottom view thereof; and,

FIG. 5 shows a top view thereof.

The dotted lines showing the bristles are for illustration only and do not form a part of the invention. 

The ornamental design for a toothbrush, as shown and described. 